EP 0507630 A2 19921007 - Apparatus and method for measuring surfaces and lenses.
Title (en)
Apparatus and method for measuring surfaces and lenses.
Title (de)
Apparat und Verfahren zur Messung von Oberflächen und Linsen.
Title (fr)
Appareil et méthode pour mesurer des surfaces et des lentilles.
Publication
Application
Priority
- GB 9107137 A 19910405
- GB 9118949 A 19910905
- US 95606792 A 19921002
Abstract (en)
An apparatus containing four linear gauges (I, II, III and IV) allows simultaneous measurement of the main parameters of a lens blank, namely the vertex radius (or asphericity), the centre thickness, and the front surface sag. A first head member (6) presents contacts (12) which contact the front conicoid surface of a lens blank (101) on a first circle. A measuring head (8) presents contacts (13) on a second circle. Gauges (I and II) measure relative displacements between the contacts (12 and 13) and the end of pointer (3), from which the asphericity or vertex radius can be calculated. Gauges (III and IV) are coupled respectively to the rear and front surfaces of the lens blank (101). The perimeter (106) of the lens blank (101) is aligned with a reference plane (R). The displacements of the gauges (III and IV) can be used to calculate the centre thickness and front surface sag of the lens. <IMAGE>
IPC 1-7
IPC 8 full level
G01B 5/207 (2006.01); G01B 5/213 (2006.01)
CPC (source: EP US)
G01B 5/207 (2013.01 - EP US); G01B 5/213 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR GB IT NL SE
DOCDB simple family (publication)
EP 0507630 A2 19921007; EP 0507630 A3 19921223; US 5317811 A 19940607
DOCDB simple family (application)
EP 92302998 A 19920403; US 95606792 A 19921002